A bare-part ornament is a stronger predictor of dominance than plumage ornamentation in the cooperatively breeding Australian Swamphen

Dey, Cody J.; Quinn, James S.; King, Ash; Hiscox, Jessica; Dale, James

doi:10.1642/auk-16-119.1

Cited by 5 publications

(3 citation statements)

References 77 publications

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“…Additionally, body coloration can correlate with behavioral and physiological traits that are of advantage in contest situations, such as aggressiveness, boldness, endurance or overall levels of activity (cichlids: Schweitzer et al, 2015;Balzarini et al, 2017;Hermannn's tortoises: Mafli et al, 2011;side-blotched lizards: Sinervo et al, 2000;Arctic char: Backström et al, 2014). Several studies demonstrated that not only the hue but also the size of colored areas can be correlated with competitive success and dominance (Viera et al, 2008;Järvistö et al, 2013;Dey et al, 2017;Tinghitella et al, 2018). This was also the case in the cichlid fish Tropheus sp.…”

Section: Introductionmentioning

confidence: 80%

Wasteful carotenoid coloration and its effects on territorial behavior in a cichlid fish

et al. 2020

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The famously diverse body coloration of cichlid fish serves communicative functions in mating and social interactions including competition for resources. Here, we examined the effects of a color pattern trait-the width of a yellow bar on a black body-on territorial competition in males and females of a color variant (''Ikola'') of the Lake Tanganyika cichlid Tropheus. First, measuring integumentary carotenoid concentrations in the yellow and black body regions, we established that wider yellow bars require more carotenoids allocated to body coloration. However, we also detected high carotenoid concentrations in the black body regions ([ 100 lg/g fresh skin), raising questions about the function of nondisplayed integumentary carotenoids. Behavioral experiments showed that fish with wider bars were quicker to explore an unfamiliar area of the tank. In experiments including presentations of fish dummies, the bar width of 'territorial' dummies had no effect on the latency time which test fish took to intrude into the dummies' territories. However, male test fish performed fewer aggressive acts against wide-barred than against narrow-barred dummy competitors. Our results suggest that intimidation by wide bars as well as correlations between bar width and explorative behavior may contribute to mediating success in territorial Tropheus ''Ikola''.

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Section: Introductionmentioning

confidence: 80%

Wasteful carotenoid coloration and its effects on territorial behavior in a cichlid fish

et al. 2020

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“…2011; Dey et al . 2017). For example, short‐term exposure to elevated androgen concentrations in zebra finches ( Taeniopygia guttata ) led to a change in bill coloration and increased dominance behavior (Ardia et al .…”

Section: Discussionmentioning

confidence: 99%

Endocrine correlates of gender and throat coloration in the southern ground‐hornbill (Bucorvus leadbeateri)

et al. 2020

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The southern ground‐hornbill (SGH) is a cooperatively breeding bird endemic to eastern and southern Africa, but is endangered in its southern distributional range. The national conservation restoration program harvests redundant chicks for captive breeding and reintroduction; with sexing and social grouping of the species evaluated by throat‐skin coloration, with adult males displaying a completely red color compared to dark blue within the red observed in adult females. However, recent findings indicate that dominant and subordinate adult males exhibit patches of blue throat‐skin. To optimize SGH management practices, it is vital to determine the role of red and blue coloration, as well as the possible drivers thereof. As a prerequisite, an enzyme immunoassay for monitoring fecal androgen metabolite (fAM) concentrations in SGH was established. Following this, fresh fecal samples were collected from 78 SGH, of various demographics and origin, across 12 captive institutions, to determine whether fAM concentrations differ between blue (B), partially blue (sB), and fully red (R) throat‐skin colored SGH. Furthermore, fAM concentrations were compared between males housed in different social groups of different age and sex classes. Individual median fAM concentrations of B, sB, and R adult males did not differ significantly but were considerably higher in B and sB males compared to R males. Social dynamics within captivity, for example, dominance, played no role as a driver of male gonadal activity or throat skin coloration. The results of the study indicate that androgens and apparent social dynamics are not primary determinants of throat coloration in male SGH.

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“…The gular pouch will probably reflect a pelican’s current condition better than plumage color during the pre-breeding season. Dey et al [73] found that a bare-part ornament was a more reliable status signal than plumage color in a cooperatively breeding bird and recommended an increased focus on bare-parts to expand understanding of animal communication.…”

Section: Discussionmentioning

confidence: 99%

Use of plumage and gular pouch color to evaluate condition of oil spill rehabilitated California brown pelicans (Pelecanus occidentalis californicus) post-release

Jaques¹,

Mills

Selby

et al. 2019

PLoS ONE

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Sublethal effects of oil spills may dampen seabird rehabilitation success due to lingering negative impacts of contamination and stress on reproduction and long-term survival. These effects can be difficult to measure while birds are in care as well as once birds are released. Expression of sexually selected traits that are sensitive to condition can provide information on physiological status of birds. We evaluated plumage molt and gular pouch skin color of California brown pelicans ( Pelecanus occidentalis californicus) following oil contamination and rehabilitation to test for differences between previously oiled and rehabilitated (post-spill) and presumably uncontaminated pelicans. Post-spill pelicans released with either color leg bands alone, or bands plus harness-mounted satellite GPS tags, were relocated and visually assessed in the field at non-breeding communal roosts and compared to surrounding unmarked pelicans in the general population. Non-oiled pelicans bearing GPS tags were also included in the study. Post-spill pelicans lagged the general population in molt of ornamental yellow crown feathers but hind neck transition into white plumage was not significantly different. Both post-spill and non-oiled pelicans wearing GPS tags had lower gular redness scores than the unmarked, non-oiled population. Pre-breeding gular pouch redness of post-spill pelicans was more strongly influenced by wearing of a GPS tag than a history of oil contamination and rehabilitation. Gular pouch redness of post-spill pelicans in the first 18 months after release was positively correlated with long term survivorship. If gular pouch color is a condition-dependent sexual signal and overall health influences plumage molt progression, our results indicate that many post-spill pelicans marked with bands alone were in relatively good condition going into the next breeding season, but those released with electronic tags experienced additional stress due to wearing the equipment, introducing a confounding variable to the post-release study.

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A bare-part ornament is a stronger predictor of dominance than plumage ornamentation in the cooperatively breeding Australian Swamphen

Cited by 5 publications

References 77 publications

Wasteful carotenoid coloration and its effects on territorial behavior in a cichlid fish

Wasteful carotenoid coloration and its effects on territorial behavior in a cichlid fish

Endocrine correlates of gender and throat coloration in the southern ground‐hornbill (Bucorvus leadbeateri)

Use of plumage and gular pouch color to evaluate condition of oil spill rehabilitated California brown pelicans (Pelecanus occidentalis californicus) post-release

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